Harness bugs, not model bugs

For six weeks, developers have been complaining that Claude got worse. You've seen the posts — "Claude Code is flaky", the AI-shrinkflation discourse. Yesterday, Anthropic shipped a postmortem . Three unrelated bugs, all in the Claude Code harness . The model weights and the API were never touched. That distinction is the whole point. What actually broke Default reasoning effort got dialled down. A UX fix dropped Claude Code's default from "high" to "medium" in early March. Users noticed it felt